i had a JB and a 59
if all you are used to is epi, ibanez and alike pickups, it's a whole 'nother world of tone.
after a while, when your ear "grows" more in regard of hearing tone nuances, they lack 'something'.. that something is usually some form of texture or another.. either depth, a broader midrange specter, more low end growl, or high end sweetness.
might be cos they are machine wound and thus perfect (regarding the winds).
this is why i think hand made products are vastly superior to machine made ones. because of the human factor involved (be it BK, SD custom made or any other).
two pickups can be exactly the same, regarding specs, but they can sound like night and day, thus proving that it's ALL in the wind and coil structure.